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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a59e4bf19db3b189946cd158b05efa6c1551c7c50eac0bcd6855554327131f' 
  AND token = 'dYUBpMcM5kZ8K+71wDH0nKz85+qEhgJ14ogxoOy4wdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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