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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6f6f8040b60df439f8fd34e7eaf03d25ccd17d1b85caaedc8bafa3565fd22a' 
  AND token = 'gHsHVK9Ygh4l2YXowUkbQ9g/N5vy1YitYPIe5pKlASo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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