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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da111f9d518b5a37c3654df5d78b02f05a775d9e41e867443324db9fbc89d55f' 
  AND token = 'QuQCy4LkgRzURy0UAC7IO2Q1muiTM6yvD5lCjR/jAXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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