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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483f9fe55bca071372b82fa610573a34248824b6a37ed88dfd1c69149a4b3497' 
  AND token = '8kEh0vJtWgwHKSkPmB6kWQK1k/Ss/UYePb2FlW1PR1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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