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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6095912a396d407a68248a13466a698c854290df410581ca9c3798cf72eff35' 
  AND token = 'eYRSh43+F/I05VyEJ1d8LqasoV8CFtK8zHdrhQYNfw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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