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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802b7e52674f16364f185313cc9b7b94b4b4f84e4298ea7ac7da00c177c95d3f' 
  AND token = 'mhCBCz85MQ6u3Ho3CSDvgbpf3jhW86e97yroSl7bNCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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