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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2345157b0e95cfa4e902497e72e10232a03844e4b407d6079b0eb3496dbc52d4' 
  AND token = 'C2kp8WztejG+m7s69yuMHsFA3ooH5tSZjtIIRPmwu40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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