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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec0ef10a0bb93f1f1a3f72b83c4f12ac5c8ec24ef362b7475216b86f09a6e17' 
  AND token = 'U8ZkVildqqcap+ng5Kw8tyaWHL2UEDXqN1AlDmkok3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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