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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d962d5943af909bde6dd6d7d7106dfd976992e69712311a82d1832ceff78b2' 
  AND token = 'TiFb3vms+E3912SYLrq0wEIMegm9Yp+rKbcHyX13L0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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