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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30eed48a3ac8a7d0dc00fc6321d5f029d4453ae94c36810d18a2de03750d5445' 
  AND token = 'n4mf1oCBI7f29Mdok5cPE1FlK6ayoFgWkcNK2GWZLBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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