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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1b79284cf2c52f9f304fc50e8ae8056235fd54a7ec6ef220507fed5f7ad33f' 
  AND token = 'Tlp5yhQFkS+y4zCx4yNb8Wnv0oc2RervzIxWKjp8vzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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