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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a410f6017fd9a00436f214c6a3b1289f86f8482cc87a24affe868f58ddc3046' 
  AND token = '0OUutBkBQ2BITzwW9luLt0txmyg9lbVLGbMJpn3vwVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00236

JSON explain

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