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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b161a4fcb458cee8c8dfe97e3befd3151d075198bc377f950b9f402ed434f43e' 
  AND token = '9PyR9k/KSn85pElHdf5984oPj2It27DlZe1Ge4rLno8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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