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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7ac1ba5b976ddf0e9f81a9d78423bd323595e4b54982e4e2cf7d1ce4d4be86' 
  AND token = 'DVBKt3dhq9naXxKtu4UQBh61DR5N6fjxC5KLvBw2zKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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