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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb8c0e255dba0df7a54b602bd03dd7768642a255e8d63915b2f10a67eb2a460' 
  AND token = 'RbYNZQZ0ae9a84ORbc59oV2UxDR/+Us2VTMXdYtrHaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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