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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddeaa8cf053c137f0e57eb8de2060dd9945d7ced916a2b9e6aa2795bd0d1fdb6' 
  AND token = 'CLIvuczygLdmo5x1HOoTMZvvlXFFU/tTvNq4WD61ZrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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