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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f2a7f7dad9d69d03abc946d71cf0c35b85f922e229d6151997a3e3e2550759' 
  AND token = 'Amh3vDKDEjhj6BuUR3khyQLCm4MVVx/K8e2aZQbY7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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