SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeef57f6a022fe1486fc6c450bccbc973ca417085a426855b2179048966de8e2' 
  AND token = 'prRXs4KXVMRY2+PqdLPCvRjq3y6PG9O8ZcuenlCJzPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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