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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eca379cb50ecf195cabc2aec18590a8d32df0ede4cf6e41e3410fa660239e476' 
  AND token = 'JnkdQ26s1tdqW/R5x59sxHGWPJxlUeNc2fqdfLqlPD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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