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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96a780b8f354a1dd82e49265e1d75abd8acc1ae7e98718c91c561f101efc030' 
  AND token = 'Zw9a6t4c5dqSHndF+UvX3MxrqaYfao5NgSFtrNWgnP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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