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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339f4db6534475939a3ceb9bbbb53673a121b9b0c7789d9b620282c6a4947d44' 
  AND token = 'cddeFhHQqVt9QsZtCuixc7vNhR7jGk8gtHhcu3I1fLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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