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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30aa1a6c358ffdbf6d38c577cbcecd06df7ff8b3f3c7d40afb448f91326f2fa7' 
  AND token = 'WS2uDYR/bXjMBTRnBxNFTg5yHTz54/4WzBUiHK2jJEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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