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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c9df04b7428465d0a3c8f80b48b9b17f58bb203a6efff90670fb1ba5806197' 
  AND token = 'OFMLeSAs99ve5TLJiRM1/db9dkePsHzvz+r9zm3gMR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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