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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1855539b3138222dbe8c29340f4c3b237a6579ba007e5de2dc51357453454792' 
  AND token = 'Gh7MT3VMgYRphLefWwV2CKyNr7j52udJX/kTgd2/GVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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