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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99f5c43f595e456eba9e1106e85e604705ced70500edfe0ae8283945c18bf03' 
  AND token = 'yPBNujl3jFjn9odOXS8ql1SZ8ErE3cRuG+HWQI8iXso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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