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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744d92bc54a88e6ada10107ea141275415f9e102d3d7994ded5d8a8f3f9d1b6d' 
  AND token = 'gY28ovI6TBT55134r3Pcvso9ScBUOP/oVCF+q9G76aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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