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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a970820883e80df1780afb4a878f39c4c7783dec80a096b921e7e1ae9797f9' 
  AND token = 'dXeBzEQhGypYn18BkIBrOR4y20MnQ64evFW+X9ElLEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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