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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ff1e822f38bb6db689f3536672cdf75f5f672165734b5d5c74e2af4fd26435' 
  AND token = 'fKmtcneU2+eaxT4aqssDw+6cnHqyQoofR/m5MHQ4Gng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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