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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cd7a91146af32f326fe45b5e8c8d667d37189007ea268445ed706e444a7221' 
  AND token = 'LIrWnZ64eCuK1v9r1Jdvn001thfXCDPJXwXLbed9Z9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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