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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad7e87d2b8818b975bc28faac545e099fac1b24e8e05e7f05d85dcf428df090' 
  AND token = 'qRUUxGZsPr2wjqiLnDgiZp2nTTS9lyrRoM+teR8KAQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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