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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f02af58ab45a6a59671e334b44c849f07fe44a40f93db3b66a9a5d5392f33f' 
  AND token = '3FS0lBNoGgKtPGnB3pS+2Fir8e2/8TLSR1oGmldipQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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