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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731dec8f39f7fc4dbe6ae1f09ac6e5a7e49916585c01916ec23af5a4bfd4f188' 
  AND token = 'KWLBNF3IXydnJ9YPE0g5dUFdOnoTnMkC48RmNn/pEjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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