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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c049c2919cf4e29625ebc5205314e568ff7278c155b65864e7a0f8305733378' 
  AND token = 'kM9m2uNrz/Om71RrMnYlxB5fHht+6P7OqKkLDHfHXwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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