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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7acfad69df1e812c193ee05490652a59e31479f29ace22c2eed7b22efbf7064' 
  AND token = 'QBlkRHosEF3l+XLixxef1HI7ed/hE+f184GL/nm0NDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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