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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9612a3c12f855b70bba16de9e0758e56a14ade862dfef71357f5dd5ce49307bc' 
  AND token = 'VBb1AuMz9gAcgqKJAaRQmKCIOjYMMQOEo++N1QzB6nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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