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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cec988247073e95c11319fd06423ed833208017f8c15e848d4ac2ba6e88b40' 
  AND token = 'xnOayUaTLTl8ea6ZGkOBzxG1NW0B04zy4wShnfIMzXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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