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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d72ef1890fd147b65bcf4ae171e3d139563a0ed24a3ab51e5757c8c204eafd7' 
  AND token = '1xI0jthNc5ij3PODZli9BPw6f2fgttbN4hLMUQ+b/0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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