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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce22d7fc1e94d2c4aee51cb885f16b8bbd7c60f62fd56960f8769966c5719961' 
  AND token = '/0TE0swXvWGI0M0wmfrJmcsI5FhE5mcvtYJ/zfDpsKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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