SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37827f3c6c0cb6278a14c55f39f5a7f91c83bcf4b265ab9035a46fb25070457f' 
  AND token = '2MCBIzhx9HKaPVFdPEVXqvl42ecAFLG+W0GaIVvXPX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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