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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e843e84178ce5c5f3dfe010f400e2b44f41300641735ff6b01b3cc9bc11c780' 
  AND token = '2VUvfA+H45f6e1Go+I9n7pnDhmAqLRED7JZI9voh+ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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