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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5eeee0f24513ed2a47839f6eab9871f19b1282995b75cc4983c77e8affc1b51' 
  AND token = '19zFeLG785Yu3/sz29/5CKo5TOcpBal6fgJtQey19VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}