SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ce08d3281cab34b1299f078b0d21e706012006b9c9e66857dcee81f1026a2c' 
  AND token = 'z6CdZDepwurY5BYLKVowJnz2Blxv+gcrX0nfqs6OJwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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