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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7f43ed1212333ab93a49cd86d3d65dcde080343c8bc9781fc999cea783078e' 
  AND token = 'Ayg7z2dWw3xJMLguVoZrR1OkitMqGXKAZ98KqvOKtb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00134

JSON explain

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