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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e012c1db054350845f87c0513a9a5ed76aade8a76989ad5db81555ad244b90' 
  AND token = 'LoAQ2kpMf5xSVa8JVPZ9fvBMtdM2fA8tZHJmnchl0k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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