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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e9f8f49ef56ac3e00b335a80794d49d895053b4812c3cb44761d2f650ab3d4' 
  AND token = 'vr+pJLC7oMT0g7QAj8qF8emArjA0rGD9+rCzKeflQ5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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