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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7368f37a20b3bd840c65c8c0183c2a602ef1fd1ccda0e17836b53c6c76de5b' 
  AND token = 'r4bTLYTxqk/KFTYM9GiTdr8xjNOlCPbuvZS9cpKnais=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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