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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68149f8adceca82daa17140493101bf6a1ed4696cc48edc7a28c9cc51e27af3e' 
  AND token = 'Mmp/8aMEHHjhCYwaKu4nhwiHOo9p07mbV9Ci1N0PWw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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