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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a54e24c9c423ff505083fba092af783a1c5b20cdc82d19d54a06f60c9c35bf2c' 
  AND token = '/Qo9rEDdik5VCHWgHeTko/JkxNHAjhGSCbq+6nVIZHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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