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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc4b51e7eb8861f43e1cd2445b1b3b7353c51304bb8e7ed185a827822ca2b85' 
  AND token = 'l2dtlg6NYn9wE16IdowFv7j4/d4NGDbCzAHxxOKkEKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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