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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60efae9b7fe4a7519997b1a12badb43f45523d02bd4112950ac047ec6e2b18c' 
  AND token = 'lpSgpG7QCTnCBmyGN2yiBZ2QUwPx5HHvGqfJl10E68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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