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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed43689d97aea3f87ca3d17098708d03574be73a60cd58244890d9c89b3b668' 
  AND token = 'qouTyBwyCJE9Cs8LwPHWLmJHSOm6B8LMmzWmfVhki0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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